lusee.Beam

class lusee.Beam(fname=None, id=None)

The main beam class, contains beam data and meta parameters. Only filename of beam to load and ID string are explicitly set in class initialization. All others are normally read in from the beam FITS file, but are included here in documentation for completeness.

Parameters:

  • fname (str) – Filename of beam to load

  • id (str) – ID string for beam, optional

  • version (int) – Beam version

  • Etheta (numpy array[complex]) – Theta component of electric field

  • Ephi (numpy array[complex]) – Phi component of electric field

  • ZRe (numpy array) – Real component of antenna impedance

  • ZIm (numpy array) – Imaginary component of antenna impedance

  • Z (numpy array[complex]) – Complex impedance

  • gain (numpy array) – Antenna gain

  • f_ground (numpy array) – Ground fraction

  • gain_conv (numpy array) – Gain convention

  • freq (numpy array) – Frequency list

  • freq_min (float) – Minimum frequency

  • freq_max (float) – Maximum frequency

  • Nfreq (int) – Number of frequencies

  • theta_min (float) – Minimum theta angle

  • theta_max (float) – Maximum theta angle

  • Ntheta (int) – Number of theta bins

  • phi_min (float) – Minimum phi angle

  • phi_max (float) – Maximum phi angle

  • Nphi (int) – Number of phi bins

  • header (dict) – File header

  • theta_deg (numpy array) – Array of theta bins in degrees

  • phi_deg (numpy array) – Array of theta bins in degrees

  • theta (numpy array) – Array of theta bins in radians

  • phi (numpy array) – Array of phi bins in radians

__init__(fname=None, id=None)

Methods

__init__([fname, id])

copy_beam([Etheta, Ephi])

Function that copies a beam object.

cross_power(other)

Function that calculates the cross-power between two beams

flip_over_yz()

Function that flips beams across yz plane

get_healpix(lmax, field[, freq_ndx])

Function that produces a healpix map of specified field

ground_fraction([cross])

Function that calculates the fraction of beam power that terminates on the ground (ground fraction), for a single beam or two crossed beams

plotE(freqndx[, toplot, noabs])

Function that plots 1D cuts of the E-field as a function of theta and phi

power()

Function that calculates the beam power of a single beam

power_hp(ellmax, Nside[, freq_ndx, ...])

Function that calculates the healpix rendering of the beam power

power_stokes([cross])

Function that calculates the beam power in Stokes components

rotate(deg)

Function that rotates the beam around the zenith (turntable rotation)

sky_fraction([cross])

Function that calculates the fraction of beam power that terminates on the sky (sky fraction), for a single beam or two crossed beams